Powassan virus neuroinvasive disease cases reported by state, 2006–2015
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Powassan virus neuroinvasive disease cases reported by state, 2006–2015

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    • Description:
      Data Table: This map shows the distribution of Powassan virus neuroinvasive disease (encephalitis and/or meningitis) average annual incidence by county from 2006 through 2015. Counties are shaded according to incidences ranging from less than 0.20, 0.20 to 0.49, and greater than 0.50 per 100,000 population. Shaded counties are primarily in Minnesota, Wisconsin, and New England states.

      Human Powassan (POW) virus infections have been recognized in the United States, Canada and Russia. In the United States, cases of POW virus disease have been reported primarily from northeastern states and the Great Lakes region. These cases occur primarily in the late spring, early summer and mid-fall when ticks are most active.

      POW virus disease is a nationally notifiable condition. Cases are reported to CDC by state and local health departments using standard case definitions. POW virus disease cases are rare but the reported number of cases have increased in recent years.

      All residents of and visitors to areas where POW virus activity has been identified are at risk of infection. People who engage in outdoor work and recreational activities in endemic areas are at increased risk of infection.

      Publication date from document properties.

      powv-by-county_2006-2015.pdf

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